<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        *{margin:0;padding:0;}
        li{list-style: none;}
        .main{width:1220px;margin:0 auto;}
        .left{float:left;width:234px;height:614px;background-color: rebeccapurple;}
        .right{background-color: rgb(175, 186, 219);overflow: hidden;}
        /* box-sizing: border-box;  padding + border */
        .right li{float:left;width: 25%;margin-bottom:14px;height:300px;background-color: saddlebrown;box-sizing: border-box;border-left:14px solid royalblue}
    </style>
</head>
<body>
    <!-- 组件A -->
    <div class="main">
        <div class="left"></div>
        <div class="right">
            <ul>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
            </ul>
        </div>
    </div>

    <!-- 组件B -->
    <div class="main">
        <div class="right">
            <ul>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
            </ul>
        </div>
    </div>
</body>
</html>